diff options
Diffstat (limited to 'pkg/tbtables/fitsio/fti2i4.f')
| -rw-r--r-- | pkg/tbtables/fitsio/fti2i4.f | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/fti2i4.f b/pkg/tbtables/fitsio/fti2i4.f new file mode 100644 index 00000000..80bd1642 --- /dev/null +++ b/pkg/tbtables/fitsio/fti2i4.f @@ -0,0 +1,129 @@ +C---------------------------------------------------------------------- + subroutine fti2i4(input,n,scale,zero,tofits, + & chktyp,chkval,setval,flgray,anynul,output,status) + +C copy input i*2 values to output i*4 values, doing optional +C scaling and checking for null values + +C input i*2 input array of values +C n i number of values +C scale d scaling factor to be applied +C zero d scaling zero point to be applied +C tofits l true if converting from internal format to FITS +C chktyp i type of null value checking to be done if TOFITS=.false. +C =0 no checking for null values +C =1 set null values = SETVAL +C =2 set corresponding FLGRAY value = .true. +C chkval i*2 value in the input array that is used to indicated nulls +C setval i value to set output array to if value is undefined +C flgray l array of logicals indicating if corresponding value is null +C anynul l set to true if any nulls were set in the output array +C output i returned array of values +C status i output error status (0 = ok) + + integer*2 input(*),chkval + integer output(*),setval + integer n,i,chktyp,status + double precision scale,zero,dval,i4max,i4min + logical tofits,flgray(*),anynul,noscal + parameter (i4max=2.14748364749D+09) + parameter (i4min=-2.14748364849D+09) + integer maxi4,mini4 + parameter (maxi4=2147483647) +C work around for bug in the DEC Alpha VMS compiler + mini4=-2147483647 - 1 + + if (status .gt. 0)return + + if (scale .eq. 1. .and. zero .eq. 0)then + noscal=.true. + else + noscal=.false. + end if + + if (tofits) then +C we don't have to worry about null values when writing to FITS + if (noscal)then + do 10 i=1,n + output(i)=input(i) +10 continue + else + do 20 i=1,n + dval=(input(i)-zero)/scale +C trap any values that overflow the I*2 range + if (dval.lt.i4max .and. dval.gt.i4min)then + output(i)=nint(dval) + else if (dval .ge. i4max)then + status=-11 + output(i)=maxi4 + else + status=-11 + output(i)=mini4 + end if +20 continue + end if + else +C converting from FITS to internal format; may have to check nulls + if (chktyp .eq. 0)then +C don't have to check for nulls + if (noscal)then + do 30 i=1,n + output(i)=input(i) +30 continue + else + do 40 i=1,n + dval=input(i)*scale+zero +C trap any values that overflow the I*4 range + if (dval.lt.i4max .and. dval.gt.i4min)then + output(i)=dval + else if (dval .ge. i4max)then + status=-11 + output(i)=maxi4 + else + status=-11 + output(i)=mini4 + end if +40 continue + end if + else +C must test for null values + if (noscal)then + do 50 i=1,n + if (input(i) .eq. chkval)then + anynul=.true. + if (chktyp .eq. 1)then + output(i)=setval + else + flgray(i)=.true. + end if + else + output(i)=input(i) + end if +50 continue + else + do 60 i=1,n + if (input(i) .eq. chkval)then + anynul=.true. + if (chktyp .eq. 1)then + output(i)=setval + else + flgray(i)=.true. + end if + else + dval=input(i)*scale+zero +C trap any values that overflow the I*4 range + if (dval.lt.i4max .and. dval.gt.i4min)then + output(i)=dval + else if (dval .ge. i4max)then + status=-11 + output(i)=maxi4 + else + status=-11 + output(i)=mini4 + end if + end if +60 continue + end if + end if + end if + end |